文章基本信息

标题：Ferromagnetism of Fe3Sn and Alloys
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作者：Brian C. Sales ; Bayrammurad Saparov ; Michael A. McGuire 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2015
卷号：4
期号：1
DOI：10.1038/srep07024
语种：English
出版社：Springer Nature
摘要：Hexagonal Fe₃Sn has many of the desirable properties for a new permanent magnet phase with a Curie temperature of 725 K, a saturation moment of 1.18 MA/m. and anisotropy energy, K₁ of 1.8 MJ/m³. However, contrary to earlier experimental reports, we found both experimentally and theoretically that the easy magnetic axis lies in the hexagonal plane, which is undesirable for a permanent magnet material. One possibility for changing the easy axis direction is through alloying. We used first principles calculations to investigate the effect of elemental substitutions. The calculations showed that substitution on the Sn site has the potential to switch the easy axis direction. However, transition metal substitutions with Co or Mn do not have this effect. We attempted synthesis of a number of these alloys and found results in accord with the theoretical predictions for those that were formed. However, the alloys that could be readily made all showed an in-plane easy axis. The electronic structure of Fe₃Sn is reported, as are some are magnetic and structural properties for the Fe₃Sn₂, and Fe₅Sn₃ compounds, which could be prepared as mm-sized single crystals.